Once in a while I check the installed packages for a possible dependency on GTK and when I find a program which has one, I look for an alternative to have one dependency less.
The last time I replaced simple-scan with skanlite and it is a much much better scanning program and with a more pleasant ui on top.
Assuming you are using Mint, Skanlite can be found in the software manager.
I am not using Mint and it is also in the Fedora repos, but there is no reason for it to not be on Flathub. Maybe when I find the time I try to package it.